Morton's Fork in Bridge: The Coup Explained With a Deal

Morton's fork is a declarer play that gives a defender two choices, both of which cost his side a trick. The classic form: you lead toward dummy's king, and the defender with the ace must either take it, which makes your king a winner for a discard, or duck, which lets the king win at once. Either way you lose only one trick where you had two losers.

It is also called the Morton's fork coup. You need three things: the ace in front of your king (the defender who plays second when you lead toward the king), a loser elsewhere to throw on the king, and an entry to dummy. Morton's fork is card play, so it works the same in every bidding system.

John Morton was Lord Chancellor to King Henry VII of England, and he raised taxes for the king. He was also Archbishop of Canterbury and later a cardinal. His argument, so the story goes, was a fork: a man who lives well is clearly rich and can pay, and a man who lives modestly must have savings and can pay too. Either way, the king's man collects.

At the bridge table, the defender plays the part of the taxpayer. Whatever he does, you collect your trick.

Take this layout in a suit contract:

West holds the ♥A. You have two losers: your singleton ♥5 (the ace will take it sooner or later) and the ♦4. Now lead the ♥5 toward dummy's king:

• West takes the ace. Dummy's ♥K is now a winner. Later you cross to dummy and throw the ♦4 on it. You lose one heart and no diamond.
• West ducks. Dummy's ♥K wins the trick. Your only heart is gone, so you never lose a heart. You lose one diamond.

Either way you lose exactly one trick. Without the fork you would lose two: the ace would win your heart, and the diamond loser would stay.

The fork works only if West has the ace. If East holds it, he wins dummy's king with the ace when you lead toward it, and you have no choice to force on anyone.

Count your tricks. Six spades, two diamonds and three clubs make eleven. The clubs are equal length in both hands, so they give you no discard, and dummy has no short suit to ruff in. You have two losers: the singleton ♥5 and the ♦4. One of them must go.

The ♥K in dummy is the key. Here is the line:

1. Win the ♦Q with the ♦A.
2. Draw trumps with the ♠A and ♠K. Both defenders follow twice, so trumps are gone.
3. Lead the ♥5 toward dummy's ♥K. This is the fork.
4. If West plays low, dummy's ♥K wins. You no longer have a heart, so you lose only the ♦4. Twelve tricks.
5. If West rises with the ♥A, he takes the trick, but dummy's ♥K is now high. Win his return, cross to dummy with the ♣A, and throw the ♦4 on the ♥K. Twelve tricks.

A double dummy solver confirms twelve tricks against any opening lead. It also confirms the condition: move the ♥A to East, and 6♠ goes one down.

Notice the timing. You draw trumps first, so a defender cannot ruff the ♥K later, but you keep the ♣A in dummy until West has made his choice. If you play clubs first and use up the ♣A, West can win the ♥A and dummy's king is stranded with no way in: the solver gives eleven tricks.

Think of the fork when you see these signs together:

• A king in dummy (or in your hand) with small cards opposite. You lead toward it, so the defender with the ace plays second.
• The ace probably on the correct side. The bidding often tells you: a defender who opened or overcalled is likely to hold the missing aces.
• A loser in another suit that you could throw on the king if it became a winner.
• An entry to the hand with the king, other than the king itself, to cash it after the ace is gone.
• Few cards in your own hand in the fork suit. With a singleton, a duck leaves you with no loser at all in that suit.

If one of these is missing, the fork may still be worth trying, but count what happens in each branch before you commit.

Leading toward a king looks like a finesse, and the card you play is the same. The difference is in what you hope for.

• In a finesse, you hope the ace is on your left so the king wins a trick. If West takes the ace, you have simply lost a trick to it.
• In a Morton's fork, you also need the ace on your left, but you gain even when West takes it, because the king then gives you a discard for a loser in another suit. The fork turns "the ace wins a trick" into "the ace wins the trick that my other loser would have lost."

That is why the fork needs a loser in a second suit and an entry to the hand with the king. Without them, leading toward the king is just a finesse.

Look at it from West's side on the deal above. If he takes the ♥A, declarer discards a diamond. If he ducks, declarer's singleton heart is gone. West cannot protect both, and no amount of thought at the table helps him.

Often there is no escape, as on the deal above. When there is one, it usually comes early:

• Attack the entry. If declarer needs a side entry to cash the king, an opening lead or a switch that removes that entry can break the fork.
• Cash out first. If the defenders can take their tricks in another suit before declarer leads toward the king, the fork arrives too late.
• Play smoothly. At the table, a defender who hesitates before ducking tells declarer where the ace is. Decide your plan before declarer leads the suit.

Double dummy defense finds none of these here, which is why 6♠ cannot be beaten with the ace on West.

• Leading the suit from the wrong side. The fork needs the defender with the ace to play second. Lead toward the king, never away from it.
• Spending the entry first. Taking your safe tricks in the entry suit before the fork leaves the king stranded if the ace is taken.
• Leaving trumps out. If a defender can ruff the king later, the discard never comes. Draw trumps first when you can afford to.
• Forgetting the other branch. Before you lead, say both outcomes out loud: "if he takes, I discard the diamond on the king; if he ducks, the king wins." If one branch has no answer, look for a better plan.

Morton's fork is a good example of a play that works whatever the defender does, once the ace is in the right place. Enter the deal above in BridgeDummy's free double dummy analyzer and try both of West's choices, or move the ♥A to East and watch the fork fail in the double dummy solver.

Related reading: the finesse, the endplay, the squeeze, avoidance play, loser on loser, slam bidding and Roman Key Card Blackwood.